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Citroen C3 Key Fob Troubleshooting Citroen c3 key fob can stop working for various reasons. Some of these include worn buttons that are not in contact with the battery, water damage, and receiver module issues. Check the 12 volt batteries. Deprogramming could be the reason that your key fob isn't unlocking your car. This occurs when certain button actions send an indication to the onboard computer to remove the key from its list of access. Dead coin battery If your Citroen C3's main fob isn't working the first thing to examine is whether the battery is dead. The batteries in the fobs are tiny, round coins that can be easily replaced within a few moments. They can be found in general stores, home improvements stores, and auto parts stores. Make sure you purchase the correct model, however. citroen car keys of fobs require CR2025 or CR2032 However, it is recommended to check the owner's manual to determine the type of battery your car requires. Before you replace the battery, take off the button pad and rub it using cotton swabs and alcohol. This will remove any corrosion and clean the contacts that typically have a gold color. Once the contacts are cleaned it is time to insert the new battery. Just be careful not to mix the two batteries because they have different voltages and sizes. The next step is to examine the battery's voltage. A multimeter that is set to the battery's voltage range will give you a reliable reading. If the battery is at a value above or below its threshold, it will need to be replaced. You can also start your car with a spare key. However, this may not always work. If the issue persists you should visit a CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser system, and get a replacement battery. Water damage If the key fob is underwater, it may lose its signal to the car. It is advised to remove it as quickly as possible out of the pool or puddle. After that, dry out the circuit board in the best way you can using a cotton swab that has been dipped in isopropyl alcohol, or electronic cleaner. If the key fob still isn't working, it may be time to invest in another one. Another common reason for Citroen c3 remote control not working is signal interference. This may occur when there is an intense electrical field close to the car or from other transmitters operating on the same frequency. The key fob should begin to work again once you are out of the zone of interference. Lastly, the Citroen C3 key fob could cease to function due to worn buttons and receivers, signal interference, module issues and a dead 12 volt battery, or a defective electronic chip. If this happens, you'll need to get it replaced by a skilled technician. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is serious you may have to replace the device. This is a relatively simple and inexpensive fix, but it's imperative to act swiftly. The longer you wait to fix the issue, the worse it becomes. It could pose a risk to passengers and you when the issue is not solved. Receiver Module Issue If your key fob ceases functioning, it could be due to the receiver module having developed an issue. Water damage is one of the numerous causes. This can happen if drop your keys or wash them. You can try to repair the issue by removing the chip and cleaning it with isopropyl or an electronic cleaner. This will stop the chip from corroding. You can also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 seconds. You can then reconnect the battery and repeat the process. If this does not fix the issue, you can take it to a dealer to have it replaced. Interference can also cause your key to stop working. It can be caused by other transmitters on the same frequency, or by objects in your vehicle. If you are unable to fix the issue, you can take your key fob in to a dealer and have it replaced. The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal is not right the receiver will not recognize the car key and display a message telling you “key not detected”. This is a problem that can be frustrating especially when you attempt to start your vehicle. Dead 12 volt battery If your key fob ceases working after changing the battery it could be damaged. This is more likely in the event that your key fob has been dropped or stepped upon However, it can occur after a service that requires the removal of panels and then reinstallation. Wires are exposed when the panels are removed. If your fob is damaged, you might require a complete replacement. A remote that receives interference from other devices and locations is a different possibility. This could cause the RF signals to become weak and prevent the car from recognizing the remote. You can reset the onboard computer in this situation, by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining power and allow the system to begin over. It is crucial to determine the size and quality of the battery before replacing it. If the replacement battery is too small or has an unsuitable voltage, it can damage the circuit board in the key fob. Before installing a battery, you must clean the chip inside the fob to eliminate any contaminants that could cause corrosion. The right battery type can ensure that the key fob is sealed and protected from moisture. Once the key fob has been installed, it should work normally. In most instances, you can use the second key to start your car, even when it displays an error message that reads “key is not detected.” It may be necessary to press the button multiple times before it responds.